Reference Guide

Item
Non-
Volatile or
Volatile
Quantity
Reference
Designator
Size
Type (e.g.
Flash PROM,
EEPROM)
Can user programs
or operating
system write data
to it during normal
operation?
Purpose?
(e.g. boot
code)
How is
data input
to this
memory?
How is this
memory
write
protected?
How is the memory
cleared?
of PCH internal
CMOS RAM)
used for
PCH
Internal
CMOS
RAM)
2) AC power off is
required after placing
the shunt.
3) AC power on with
the shunt in place and
then can be removed
Primary BIOS
SPI Flash
Non-
Volatile
1
U_SPI_BIO
S
32 MB
SPI Flash
No
Boot code
SPI
interface
via PCH
Software write
protected
Not possible with any
utilities or applications
and system is not
functional if
corrupted/removed.
iDRAC SPI
Flash
Non-
Volatile
1
U_BMC_S
PI
4 MB
SPI Flash
No
iDRAC Uboot
(bootloader)
SPI
interface
via iDRAC
Embedded
iDRAC
subsystem
firmware
actively
controls sub
area based
write
protection as
needed.
User cannot clear
completely. However,
user data, lifecycle log
and archive, SEL, fw
image repository can
be cleared via Delete
Configuration and
Retire System,
accessible in Lifecycle
Controller interface
BMC eMMC
Non-
Volatile
1
U_EMMC
4 GB
eMMC NAND
Flash
No
Operational
iDRAC FW,
Lifecycle
Controller (LC)
USC partition,
LC service
diags, LC OS
drivers, USC
firmware
NAND
Flash
interface
via iDRAC
Embedded
FW write
protected
User cannot clear
completely. However,
user data, lifecycle log
and archive, SEL, fw
image repository can
be cleared via Delete
Configuration and
Retire System,